com.helger.commons.functional.IBiFunction Maven / Gradle / Ivy
/**
* Copyright (C) 2014-2019 Philip Helger (www.helger.com)
* philip[at]helger[dot]com
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.helger.commons.functional;
import java.io.Serializable;
import java.util.Objects;
import java.util.function.BiFunction;
import java.util.function.Function;
import javax.annotation.Nonnull;
/**
* Represents a function that accepts two arguments and produces a result. This
* is the two-arity specialization of {@link Function}.
*
* This is a functional interface whose
* functional method is {@link #apply(Object, Object)}.
*
* @param
* the type of the first argument to the function
* @param
* the type of the second argument to the function
* @param
* the type of the result of the function
* @see IFunction
* @since 8.6.3
*/
@FunctionalInterface
public interface IBiFunction extends BiFunction , Serializable
{
/**
* Returns a composed function that first applies this function to its input,
* and then applies the {@code after} function to the result. If evaluation of
* either function throws an exception, it is relayed to the caller of the
* composed function.
*
* @param
* the type of output of the {@code after} function, and of the
* composed function
* @param aAfter
* the function to apply after this function is applied
* @return a composed function that first applies this function and then
* applies the {@code after} function
* @throws NullPointerException
* if after is null
*/
@Override
@Nonnull
default IBiFunction andThen (@Nonnull final Function aAfter)
{
Objects.requireNonNull (aAfter);
return (final T t, final U u) -> aAfter.apply (apply (t, u));
}
}